DF is one of my favorite feeds. One nice touch on DF: when a post is about another website, clicking on the title takes the reader to the external content, keeping the permalink as a secondary action. The permalink is demoted to a simple iconic representation of his blog (★), so the reader gets a subtle hint about which link takes her to DF. I’ve ripped off the concept completely with a little WordPress wizardry (this should go over well). Frankly the idea shouldn’t just be a DF thing, it should be a blogging pattern. Thanks for the inspiration Mr. Gruber.
Update: This behavior is now broken after a botched WordPress update, so I’ve reverted to default behavior. The DF behavior on aggregators was suboptimal anyways: the entry would say “Benjamin Stover’s Blog” but the link of course would go to the article I point to, with no summary. Applicable usability rule: expectations tend to override other considerations.